100 строки
2.1 KiB
C
100 строки
2.1 KiB
C
#include <linux/reiserfs_fs.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/xattr.h>
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#include <linux/reiserfs_xattr.h>
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#include <asm/uaccess.h>
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#ifdef CONFIG_REISERFS_FS_POSIX_ACL
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# include <linux/reiserfs_acl.h>
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#endif
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#define XATTR_USER_PREFIX "user."
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static int
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user_get (struct inode *inode, const char *name, void *buffer, size_t size)
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{
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int error;
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if (strlen(name) < sizeof(XATTR_USER_PREFIX))
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return -EINVAL;
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if (!reiserfs_xattrs_user (inode->i_sb))
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return -EOPNOTSUPP;
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error = reiserfs_permission_locked (inode, MAY_READ, NULL);
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if (error)
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return error;
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return reiserfs_xattr_get (inode, name, buffer, size);
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}
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static int
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user_set (struct inode *inode, const char *name, const void *buffer,
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size_t size, int flags)
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{
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int error;
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if (strlen(name) < sizeof(XATTR_USER_PREFIX))
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return -EINVAL;
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if (!reiserfs_xattrs_user (inode->i_sb))
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return -EOPNOTSUPP;
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if (!S_ISREG (inode->i_mode) &&
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(!S_ISDIR (inode->i_mode) || inode->i_mode & S_ISVTX))
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return -EPERM;
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error = reiserfs_permission_locked (inode, MAY_WRITE, NULL);
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if (error)
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return error;
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return reiserfs_xattr_set (inode, name, buffer, size, flags);
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}
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static int
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user_del (struct inode *inode, const char *name)
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{
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int error;
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if (strlen(name) < sizeof(XATTR_USER_PREFIX))
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return -EINVAL;
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if (!reiserfs_xattrs_user (inode->i_sb))
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return -EOPNOTSUPP;
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if (!S_ISREG (inode->i_mode) &&
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(!S_ISDIR (inode->i_mode) || inode->i_mode & S_ISVTX))
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return -EPERM;
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error = reiserfs_permission_locked (inode, MAY_WRITE, NULL);
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if (error)
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return error;
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return 0;
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}
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static int
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user_list (struct inode *inode, const char *name, int namelen, char *out)
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{
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int len = namelen;
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if (!reiserfs_xattrs_user (inode->i_sb))
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return 0;
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if (out)
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memcpy (out, name, len);
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return len;
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}
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struct reiserfs_xattr_handler user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.get = user_get,
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.set = user_set,
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.del = user_del,
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.list = user_list,
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};
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